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Original commit message from CVS: 2005-07-13 Andy Wingo <wingo@pobox.com> * examples/vumeter.py: New file, a VU meter application that reads from alsasrc. * examples/fvumeter.py: New file, imported from Flumotion and relicensed under the LGPL. Implements a simple VU meter widget.
103 lines
3.2 KiB
Python
Executable file
103 lines
3.2 KiB
Python
Executable file
#!/usr/bin/env python
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#
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# gst-python
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# Copyright (C) 2005 Andy Wingo <wingo@pobox.com>
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#
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# This library is free software; you can redistribute it and/or
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# modify it under the terms of the GNU Library General Public
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# License as published by the Free Software Foundation; either
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# version 2 of the License, or (at your option) any later version.
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#
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# This library is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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# Library General Public License for more details.
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#
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# You should have received a copy of the GNU Library General Public
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# License along with this library; if not, write to the
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# Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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# Boston, MA 02111-1307, USA.
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# A test more of gst-plugins than of gst-python.
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import pygtk
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pygtk.require('2.0')
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import gtk
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import gobject
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import pygst
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pygst.require('0.9')
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import gst
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import fvumeter
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def clamp(x, min, max):
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if x < min:
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return min
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elif x > max:
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return max
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return x
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class Window(gtk.Dialog):
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def __init__(self):
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gtk.Dialog.__init__(self, 'Volume Level')
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self.prepare_ui()
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def prepare_ui(self):
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self.set_default_size(200,60)
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self.set_title('Volume Level')
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self.connect('delete-event', lambda *x: gtk.main_quit())
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self.vu = fvumeter.FVUMeter()
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self.vu.show()
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self.vbox.pack_start(self.vu)
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def error(self, message, secondary=None):
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m = gtk.MessageDialog(self,
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gtk.DIALOG_MODAL | gtk.DIALOG_DESTROY_WITH_PARENT,
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gtk.MESSAGE_ERROR,
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gtk.BUTTONS_OK,
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message)
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if secondary:
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m.format_secondary_text(secondary)
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m.run()
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def on_message(self, bus, message):
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t = message.type
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if t == gst.MESSAGE_STATE_CHANGED:
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pass
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if (t == gst.MESSAGE_APPLICATION and
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message.structure.get_name() == 'level'):
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s = message.structure
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self.vu.set_property('peak', clamp(s['peak'][0], -90.0, 0.0))
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self.vu.set_property('decay', clamp(s['decay'][0], -90.0, 0.0))
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else:
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print '%s: %s:' % (message.src.get_path_string(),
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message.type.value_nicks[1])
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print ' %s' % message.structure.to_string()
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return True
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def run(self):
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try:
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self.set_sensitive(False)
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s = 'alsasrc ! level signal=true ! fakesink'
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pipeline = gst.parse_launch(s)
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self.set_sensitive(True)
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watch_id = pipeline.get_bus().add_watch(self.on_message)
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if pipeline.set_state(gst.STATE_PLAYING) == gst.STATE_SUCCESS:
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gtk.Dialog.run(self)
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else:
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self.error('Could not set state')
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pipeline.set_state(gst.STATE_NULL)
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gobject.source_remove(watch_id)
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except gobject.GError, e:
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self.set_sensitive(True)
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self.error('Could not create pipeline', e.__str__)
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if __name__ == '__main__':
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w = Window()
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w.show()
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w.run()
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